Figure 4

Radiolabelled feeding experiments with L-ascorbic acid (AsA) precursor substrates. Uptake and conversion of ¹⁴C in immature green, mature green and red fruit discs of ‘Santorini’ (white) and ‘Ailsa Craig’ (gray) after incubations for 24 hours with 1 μCi L-[6-¹⁴C]AsA (I), [U-¹⁴C]D-Mannose (U-¹⁴C]D-Man; II) and [U-¹⁴C]D-Glucose (U-¹⁴C]D-Glc; III). Results are represented as total radiolabel (μCi) recovered in tissues (A), and as total radiolabel (μCi) incorporated into total ¹⁴C-AsA (B). Data show the mean ± SD of three independent experiments. Different letters indicate significant differences (P < 0.05) between values based on Duncan's multiple-range-test in SAS.